Tokyo, Osaka, hotsprings. I want to see it all!
Southwest of the main island of Japan:
One of my main goals will be to drop by Iriomote Island, it's a tiny island with a national park.

The whole island and its inhabitants are protected under international laws.
The small island contains a very special and nearly exstinct race of cats called the Iriomote mountain cats
(Yamaneko [yama = mountain, neko = cat] in Japanese)